Method for continuously melting down scrap metal

Details Method for continuously melting down scrap metal Method for continuously melting down scrap metal

C - Chemistry, Metallurgy

21

C

C21C 5/56 (2006.01) C21B 5/02 (2006.01) C21B 13/02 (2006.01)

Patent

CA 2126188

The invention concerns a method for continuously melting down scrap metal, in particular bales of scrap metal containing residual plastic materials, the scrap being fed to a melt-down reactor and the heat necessary to melt the scrap being provided by direct heating from underneath by burners located near the tapping point. Part of the gases produced are passed back, after utilizing the sensible heat and cleaning, as combustion gas into the melt-down reactor and the remainder passed out as output gas. A particular advantage of the invention is that, when melting down scrap metal containing plastic, it avoids the need for large-scale gas-purifying facilities and the pyrolysed materials contained in the starting material are utilized to good effect.

Dans un procédé de fusion continue de ferraille, notamment de paquets de ferraille, qui contiennent des matières plastiques résiduaires, selon lequel la ferraille est chargée dans un réacteur de fusion (1), la chaleur de fusion est amenée par chauffage direct du dessous par l'intermédiaire de brûleurs (7) placés près de la percée, le processus s'opère dans le réacteur de fusion (1) de manière réductrice. Une partie des gaz produits (12), après utilisation de la chaleur sensible (16) et épuration (21, 23, 29), est renvoyée dans le réacteur de fusion (1) sous forme de gaz brûlés et la proportion restante est évacuée sous forme de gaz de sortie (35), ce qui permet d'arriver lors de la fusion de ferraille contenant des matières plastiques, à ne pas avoir recours à des installations d'épuration de gaz surdimensionnés et à réutiliser les substances pyrolysées contenues dans le matériau de départ.

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